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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc138e1a68ea1392888665ec9e0267c4d6dd73291266bf8136df1c01e344108' 
  AND token = 'j9T6PbobKhFkArspnf1O5u2L0qD6trrbV0Mnv/cVJPQ=' 
  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"
    }
  }
}