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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e839456f385c3848cf13e885a662501510c2a1f8f79202ba6f511da1dd7226' 
  AND token = 'Javy4OYBny+GoaX6t+2Ic9QDRXCVXMwVJ7YelT1Ieqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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