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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621cd7525e99fc60ddc7d5fd885701c15f5685e2be1ab86ace51aca6b538cc3b' 
  AND token = '7EtaR3ZClCo5ZB+FU0l2PPqx4q5f4fFV7XMmq6r2RR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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