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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09ca4cebee4d1a66a290bde5f5a3e6aaf4c55050923b838280876dca03a46e8' 
  AND token = '4YXDkmto8jvc+Cpc0ePtZu1S4mZaXWXnp5LkMoGrPqc=' 
  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"
    }
  }
}