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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76dc68a440d75ac5d94c3274500f02c6655299a2523c64c0831c8cee9907a9f3' 
  AND token = 'sa5VAro9EIxqbYpEmNg72aNQuqpw5nn4vSo3FEFIFiQ=' 
  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"
    }
  }
}