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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a135b1776929c67f794e51e4c04bd634e7743e071684e8191bdf6f4112c8be31' 
  AND token = 'wt6lAMmt4hyE/kAYtMj3k54ZndAgYSYr8IllvUejavU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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