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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30dd1cf7f3e576f92584179be0d0fbe997d9cd656f7775fd28bb3a004b9206a' 
  AND token = '4NqDStF+/7jbfvSBB6LHpzQDUqbd49ftThLRA5WTf3U=' 
  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"
    }
  }
}