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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c673a5362d553a086d50a992b30b7030f5c108a38d17f4e7c0ad047b30f412' 
  AND token = 'AfkSltSYW2Yl25qaYneFxfd2D34RTY++OvgqeK1c6Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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