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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e100e1f9311c4f4b09eccc22a18843debe392b30ab0f39c78b9a45cd4c0a0570' 
  AND token = 'd4jeA1phEvMH6yv3njrNgD0qt0hS7MMCZho+C/kMKlk=' 
  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"
    }
  }
}