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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89129e19a653b4c01e2c8c5bc90e50f4b9f8e406856fe0dccaa4f39f36f2b070' 
  AND token = '2F29b9u5fNfxhI6DoDD3UuAM/qiCFaFfsn6pX80LNe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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