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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ae2c21928af5b3a0ba7cd1f63ed7cf3981f9eaf36a5bac5b5c8859a64eb5ea' 
  AND token = 'aT/FUbIWR1SE2e54Gi3BRYGekJpjIZhHMMnc+BXdS+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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