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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e8461afa05e3b1282453f9bb2afd2a4e551a76d9a4cd2fcb76369073e02097' 
  AND token = 'HZhm8H9xcPPwGhoT9o0t2wn0ZYXzX8IyzJndqs62gww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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