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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64ed1906387082526eea355abbe6571e11850b655a35732a6eccaf12f380d01' 
  AND token = '5oUlIKDLZ5NMJNf9EovVfSvy4poiIrFGC1wZU35YW2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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