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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bef066e0624ed7d425301f558ddc1386118fac99027fc8a74cacfe1c986a8c' 
  AND token = '6a01YZsKB936HQ7JXfORHxqk1o2lgJsa+5UppySf+1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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