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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3422b6c51ef143ef2b339ce631c620df791bb89fb1a048cd9200f810e25ec4e' 
  AND token = 'yjalm8fAsD/c+zVXpbh/IaEixvLBqC7jn63rmAaqsUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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