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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b6eeccd3c7b3c6e74e99e1f7dfa052228c15d58783ac0b34574cdc389c265e' 
  AND token = 'iUsp+f6CbiIDUo743JoMhmSFbZ5xQ2cImDRbuBdZJbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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