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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86df7ba166cd111d866a48f7dc084e85c778f9e3b0e67745b125f78267dc7ca' 
  AND token = '4jPrCZlFq6MhHyPQkfPZb8a5vSg3C6ROf28p2vGhApo=' 
  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"
    }
  }
}