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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d5af299f7c4a444fa20fe79759965c31a7ce32400cf143469c4125005643be' 
  AND token = '1f5PU6oA1tjIz3XCSXhZfNyuDV9cL0Cu4Vuy++h+ibE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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