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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cacba4b29c8a73fa68700c2c004ae8a58b9017e199e3b1a7dd61c7b6d6c656dc' 
  AND token = '7YhYJZhP4JSgqQprj9S2Q0g1seh8v125OYDx+rNwZgE=' 
  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"
    }
  }
}