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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f75b8570a511680a19fff8c44d49b664f4d6ce4e464e31a8e73bbe51f4c18e' 
  AND token = 'QQ1Kkqv1fOvBIjsquVk18R3twP2bYnTJ7a5gQnDqPOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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