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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86dce575a5bd05803b48339537ad852be71e4e709b4378c3f46d0790f43ab4a4' 
  AND token = 'k9kTMr6r81e+YUQUzq2O/Cc5l+zFXQCz3sLpF00Q9to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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