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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbee458b8a8cd9c0e43ee5958cb95f0c9c5471f22c25c97bb234ecf4a77c128' 
  AND token = 'SC1sErid+Bee0+E8AJBDhxl5BAraIhmZvhJBcdByw4I=' 
  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"
    }
  }
}