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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2441e5f920c1e7ec6ff51de357d67acb19477463926511f9a4ce0164aacc1b2' 
  AND token = 'DyHue1IbU8//vtEMKdZAVykVzxVROxw1MZXSERFFM8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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