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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ea4a246da3672bf1f76ac4d156e8196462cc4db54fcf46c80b44ab91d68221' 
  AND token = 'EwG89NHvnJ8qXE+L9LuClpI2Du8WPYbCcymSd6+wvTE=' 
  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"
    }
  }
}