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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8651ce8b65a34bfc6616f824de3e35d8f85d4b850e16ff605f435518b1a56a8' 
  AND token = '88Semx+5zg7SGO6hEOwxtzIiUjqdXrRNx4GSnaKwA14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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