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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56c674adda75ce3ed7bbf8c57647f3485233fbbddf41fd3b5736522a7d53f5c' 
  AND token = '2t5dh1JabeLYXE+XV/DqdHNqA+tr9mxfc7ICmGB4Q3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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