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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08441e79046de344539c653f8dabe791e06cf89ea5d2b19502f32a755ef11e70' 
  AND token = '8G2Sy5Zq43TnMU0K/pP0XFkIRLLVXW/sGIUpj8B26YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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