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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a1d449abda8d6f2c722e80152a24a18709d9312085853e06c52c4572dd400c' 
  AND token = 'xp0Z74kSy2Z6hrCkUZPoljZCkBP//xqn1SmOQUHYXt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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