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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc186bbe9cc050219b920e4be0a58502f0c7bdcdaf727d5bcdd3a5b90f9fce4' 
  AND token = 'Iz/EfglVAxj14vQ2U714Ems0TtDKLLTlSwWzGvn4YVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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