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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ed191e1f8b1f114ec4e46b2e68d74ebe48866bbc29aab7fa0109b5bbb49f8ff' 
  AND token = '0lejP8vtQjJ7XCfzAQAtG1VzdIfOA/gTxj702fp+gx8=' 
  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"
    }
  }
}