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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c655b1c621d4dba911d90c2efa67454a04c7af6a9d41454be434db38b5c8bc' 
  AND token = 'tSmYNkJSOncFjzISYmYJn4G0PEGk+myQT2PMSNxfU+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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