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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e22cd1dca76ccbd2b9995f4c23234aac07469c5fb4d83af9701755efdb53b759' 
  AND token = 'n3OCdF/K1q/Bm4BFh4+bQ5Kx3Wfi/YG57USP4bWus6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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