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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca06d24a66476cc8c082a7aecf6d1062ec51780c9cedb80d9079f7ca1af3059' 
  AND token = 'm+LgBBe5IiN9G/dqY1CiYNBasvpTVbtkNch2bkIe1JU=' 
  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"
    }
  }
}