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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a6765251f6a727b62a9b53e51c1a903b07e90ed5e1eba08a9dc18af4b84aaf' 
  AND token = 'uKanT28WvP0fnQFrVMrhDhxRH1Ihsx7Z/f7VN4ZVFk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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