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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75216b27eb04c63ae95ac117a388a96e70d2b254e44c49d67bd64439e2d5e85' 
  AND token = 'iHXLTKMZk+QCmzrh+bv025oatgA4noOWhGkMy72hF68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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