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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093a96d2f5e65c16cad2a1276f88cc257b72f0b64d0172605d2c7c00d90a97a4' 
  AND token = 'gFNcENSrdKUpgwBeqwOhnbdtcjM6ZQqZHoF8V1xFsWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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