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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f4ef2635f7797ab3e0389492236ae083543eb4e2bc09e7563059dead1c1628' 
  AND token = 'WMDdSQ3/1u4q6AM9qzC/9fueh00eHS8etG/Ya9aZPf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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