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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e755f31913cb4e189572d24b6ff110008c33716b3a0f227b58e759b634db0825' 
  AND token = '5AEtRMw2474+ygCOWRqtOhYY7s7q45qo/9x2pVh5FDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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