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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b21d6d31b311cd0b27f446fcee59198bdb27d4e967be5bbe7e9ae778ca281c' 
  AND token = '3ai26RyF5yzM8FuZ7WZlFqpnncSRmG9vhK4jm8Aii3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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