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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44809260960a1911738079be3ec8550b7615d772ff87a1abcb43171b1190eb3' 
  AND token = 'wCKd4tauIH9MO9uPJN2RGYtyKvFm8TK2mSe8upCD8Lc=' 
  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"
    }
  }
}