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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d30b4fce736f74ff1ff7c02bb047eb28e612983e68dc5c9c0fa8bb5c2bd904' 
  AND token = 'vqBXqcvpZRIRXBLp46kEpcEzAyMabTgdKHv8scEatl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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