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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983edbe2e100f14bb0c96101aab86f1eb731030e6a9a32683a9d3753548af7bc' 
  AND token = 'f2C4QK2+CdwzA1RbZkoYvP731+N9PXIJzDRykE9EipE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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