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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c36a6fdac34de40389e0d3135f4e9773a72f1b66b97e799a4e47fc83fa3ad5' 
  AND token = 'zj1d4vM+NO6I81MtTIygFQBF5o/KL00PRe/EPHIjTOs=' 
  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"
    }
  }
}