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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a299584ba0ca910d2f8d8c00c574e743d1d10e3c5f58acd8726ee5ddea1d98e7' 
  AND token = 'p4rHjz0qFfpGyrYEL5mZSk+SrnTWRX0u19ysrb0Bn2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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