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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3bfdf2aa0c04c664310b2fa30103ac06ff49145abef49e3b7614eb5c6b9ff4' 
  AND token = 'qbwi24rZ/BrZMDOdz0t8hQEXt9AqBy1ZUVRvH7H6cR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}