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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7371a7003231d2c7f2bd5adcb0d5418802afedb860598f30a7cdb7a12eb0a6d8' 
  AND token = 'nRXyKlXxNTxWbx2oWByydaU+6s7aKtTeOij8h4i4CEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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