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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e52bcdc4d0a8ee043d8580a9b38aa8c5524f8518407cddf4e9131e72309e62' 
  AND token = 'RF40ETc2V+NMXrZwZR1OSdHqt4AZpENT4f34n3ZUSFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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