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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0541e1e9d6679ddffbffa756f1c5cda4f8f9f3eace5fb38a8505c14304b3e91' 
  AND token = 'V2jVIKmIzPLkRxgFyjgIsa02Okw6EGWWPNH3y0dYQuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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