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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e109064276541d9231f1a9c3e5e1c3f5393c97e635d96103b666fc64bd39cf4' 
  AND token = 'pFtNMI1oiQIZ1Y//qhwomCKe23C06Ee4hIDlYjqdvnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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