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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a474022139fc7b4b451414c176e8a1feef6ff30aa64d1d3742829fe95b78a0a' 
  AND token = 'ZaN0G0d6Jf4GHmk+tgMWbl7TOVkv0FaeFchxhGMNpto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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