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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9678bef4f70765a61a36ce3eb17f4a07ac9942c00f3baba0c21ea6d855d5b935' 
  AND token = '7NPcjAuk2PoFyOTOq5acJvHQi0wo5a2SLvb4Ru4NHZ4=' 
  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"
    }
  }
}