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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a172d76d93d921e50c735e7afa96e1f92b8a827a6168af1080a6e7784bc4e90' 
  AND token = 'cAfLq5V8Z2Kif7IS+nHYNvDsKOR5MbztMMazR8pNv74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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