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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102de14d1486ed0702aa5e58cb19c65f45b742eb8b92087a495b81c2e30ad973' 
  AND token = 'O/ipvfLsIv54q4w1EiWEjWUEyte2lOoLU5VNpWEJD/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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