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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '816db9c31e230727fb69437c010e2aa8840af6559879fac26207e18d30d6a1dc' 
  AND token = 'XHEHxHS0eD86WDKQPHTp5cjpcVfkBuIXz1JH9qECCT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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