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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dad6122b34825933234048004accae9e8a839b18a2f9d150823bd3192dffc94' 
  AND token = 'mZBMPpM//pu2hK/sF4GBqgj2jA4neGskE8OK2u5uxYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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