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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62558d001cec31d7f2983cdf17008bf77b170dad0af60e783de74e214396d5ab' 
  AND token = 'oayN1SfiHn8+JbU8V7li6IrhdfrsS+3gPNgBA4a0zEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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