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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad4cac62c0ccdb110ec4e2f96557ed380279d6dbf9d052140f90276c71cea59' 
  AND token = 'ITdj7/1ctyAg7vgma/jDUxY7quBQdRshqCcDzcRFM5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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