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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0cd805b734928cd591e1ee7a16889a6cefce4a435b159aa521561dc1a501c5' 
  AND token = '6P0YN8Q1d6nMS4EYp8kXUG+T0G5iHmNQHPf8y2ipJ6g=' 
  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"
    }
  }
}